Plaster board



F. M. VENZIE Sept. 20, 1932.

PLASTER BOARD Filed Feb. 1. 1950 n .val nl "1' l N V EN TOR A TTRNEY.

Patented Sept. 20, 1932 UNITED STATES iasn FREDERICK M. l'VENZJEL OF PHILADELPHIA, PENNSYLVANIA PLAS'IER BOARD Application mea February 1',A 1930. serial m.'425,151.

A certain new and useful plaster board, of which the following is a specification, the same being a continuation in art of my application for Letters Patent erial No. 363,--

894, filed May 17, 1929: y

This invention, stated in its broadest terms, relates to a building structure and has more especial relation to a wall, ceillng, and partition structure in which so-called plaster boards of water-proofed type and a paper covering are employed.

One purpose ofthe present 1nvent1on 1s to provide a plaster board which islight, strong, durable, and relatively inexpensive to manufacture, and which, in addition to possessing a conventional water-prooiing body portlon of relatively large cross-section, is possessed upon one face with a very thin sheet of paper, which sheet of paper is treated with a composition to render the same capable of resisting moisture, dampness, and the like, said plaster board having' applied to the opposlte face thereof a very thin sheet of conventional paper, the combined layers of very thin paper sheets increasing but very little the original,

cross-sectional dimension of the plaster board, which is important both from a lshipping and erecting viewpoint.

Another purpose of the present invention is to provide a plaster board of the character stated in which in addition to the said treated sheet of paper there is applied to that face of the plaster board opposite said treated sheet of paper, an additional sheet of paper treated to possess fire resisting properties.

Still another purpose of the present invention is to employ thin sheets of paper possessed of moisture and dampness resisting properties, and also lire resisting properties, which sheets of additional paper increase but little the cross-sectional dimension or thickness of the original plaster board.

A still further purpose of the present invention is to provide a plaster board of the character stated having a relatively thick body of water-proofing material and thin sheets of paper applied thereto, applied to at least one of which sheets of paper is a coating of asphaltum paint.

With the above and other purposes in view,

the invention consists of the novel construction hereinafter described and fnally'claimed.

The nature, characteristic features and scope of the invention will be more fully understood from the following description taken in connection with the accompanying drawing forming part hereof, and in which:

Fig. 1 is a view partly in section and partly in elevation illustrating a wall and ceiling structure illustrating the manner of' applying plaster boards embodying the invention.

Fig. 2 is a fragmentary view in perspective illustrating a plaster board structure embodying the invention.

Fig. 3 is a similar view illustrating a slightly different form of construction.

Fig. 4 is a similar view, with Certain parts broken away, of still another form.

Figs. 5 and 6 are fragmentary views in section of still other forms of plaster board.

For the purpose of illustrating my invention, I have shown in the accompanying drawing several forms thereof which are at present preferred by me, since the same have been found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the recise arrangement and organization of the instrumentallties as herein shown and described.

In the drawing there is shown a relatively thick body or board of a composition possessing` watery-proofing characteristics. In the plaster trade such body or board is covered or enveloped by very thin sheets of paper and is commercially known as plaster board. In practice these plaster boards are of rectangular configuration and may be used for walls, ceilings, or partitions, and may be supported in any well understood manner. As an eX- ample, in a' wall and ceiling structure, and referring to Fig. 1, the reference numeral 5 designates the wall of a building and 6 a vertical beam spaced therefrom as at 7 to provide an air space. The reference nu.'- meral 8 designates a beam supported by the wall 5. The plaster board embodying the invention may be of varied form, but the wall plaster boards are designated 9 and the ceiling plaster boards 10. The wall and ceiling plaster boards are secured to the beams 6 and 8 by means of clips 11, as fully shown and described in my co-pending application for Letters Patent aforesaid erial No. 363,894, and which clips form no part of the present invention.

Taking up now the plaster board, the reference numeral 12 designates a relatively thick, rectangularly -shaped block or board formed of a composition possessed'of waterproofing characteristics. To one face of this block or board I apply a very thin sheet of paper 13 which I treat with desired material to resist dampness and moisture. This sheet of paper 13 so treated is compressed to place upon the material forming block 12. In practice this face of the plaster block con# stitutes the inner face and is applied to the upper part of beam 8 for a ceiling block and is applied to the outer part of beam 6 in a wall structure. This prevents dampness and moisture penetrating to the room interior, To the opposite face of a plaster block I apcium chloride to render the finished plaster board im ervious to water.

What claim is:

As a new article of manufacture, a plaster board the body of which comprises a plastic composition formed of plaster of Paris, powdered cork, asbestos, and calciumchloride said body having applied to 'one face thereof and compressed thereon a thin sheet of paper the same being moisture resisting, and the other face of said body having compressed thereon a very thin sheet of paper of fire resisting properties.

. FREDERICK M. VENZIE.

ply a thin sheet of plain or conventional paper 14, see Fig. 2. These thin sheets of paper add very little to the original thickness of a plaster block which is a very important item,

as is readily apparent.

Instead of using what is termed plain or conventional paper I may use a very thin sheet of paper 15 which is fire resisting in character, see Fig. 3.l

If desired I may employ thin sheets of paper 16 and 17, nas seen in Fig. 4, and apply to the face of sheet 16 another thin sheet of paper 18, and-apply to said paper 18 a layer of asphaltum paint or the like 21 forlthe purpose of preventing moisture and the like reaching block 12. If desired I may also treat paper 1'(` with reproofing material, not shown in the drawing.

If desired I maby apply toblock 12 sheets oi paper 19, see ig. 5, which I treat with suitable material to render said sheets moisture and damp proof in character.

If desired, as shown in Fig. 6, I may apply to block 12 sheets of paper 20 which I treat to render {ire-proof in character.

Not only is the plaster board herein described Water'proof in character, butit is provided .with such paper coverings as render the board re resisting and moisture resisting and either or both of these in eiicient manner without material increase of the thickness of conventional plaster board, which is important. My plaster board is lalso sound resisting in character.

In the above described plaster board I first form a plaster board of plaster of Paris in the proportion of about in bulk and add about 10% of powdered cork and about 10% of asbestos. When mixing the above ingredients with water I add about 20% of cal- 

